130 lines
3.6 KiB
C
130 lines
3.6 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdint.h>
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#include "virtio_pci.h"
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#include "virtio_logs.h"
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void
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vtpci_read_dev_config(struct virtio_hw *hw, uint64_t offset,
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void *dst, int length)
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{
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uint64_t off;
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uint8_t *d;
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int size;
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off = VIRTIO_PCI_CONFIG(hw) + offset;
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for (d = dst; length > 0; d += size, off += size, length -= size) {
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if (length >= 4) {
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size = 4;
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*(uint32_t *)d = VIRTIO_READ_REG_4(hw, off);
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} else if (length >= 2) {
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size = 2;
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*(uint16_t *)d = VIRTIO_READ_REG_2(hw, off);
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} else {
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size = 1;
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*d = VIRTIO_READ_REG_1(hw, off);
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}
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}
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}
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void
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vtpci_write_dev_config(struct virtio_hw *hw, uint64_t offset,
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void *src, int length)
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{
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uint64_t off;
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uint8_t *s;
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int size;
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off = VIRTIO_PCI_CONFIG(hw) + offset;
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for (s = src; length > 0; s += size, off += size, length -= size) {
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if (length >= 4) {
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size = 4;
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VIRTIO_WRITE_REG_4(hw, off, *(uint32_t *)s);
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} else if (length >= 2) {
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size = 2;
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VIRTIO_WRITE_REG_2(hw, off, *(uint16_t *)s);
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} else {
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size = 1;
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VIRTIO_WRITE_REG_1(hw, off, *s);
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}
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}
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}
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uint32_t
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vtpci_negotiate_features(struct virtio_hw *hw, uint32_t guest_features)
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{
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uint32_t features;
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/*
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* Limit negotiated features to what the driver, virtqueue, and
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* host all support.
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*/
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features = (hw->host_features) & guest_features;
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VIRTIO_WRITE_REG_4(hw, VIRTIO_PCI_GUEST_FEATURES, features);
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return (features);
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}
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void
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vtpci_reset(struct virtio_hw *hw)
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{
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/*
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* Setting the status to RESET sets the host device to
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* the original, uninitialized state.
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*/
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vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_RESET);
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vtpci_get_status(hw);
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}
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void
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vtpci_reinit_complete(struct virtio_hw *hw)
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{
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vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER_OK);
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}
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uint8_t
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vtpci_get_status(struct virtio_hw *hw)
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{
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return (VIRTIO_READ_REG_1(hw, VIRTIO_PCI_STATUS));
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}
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void
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vtpci_set_status(struct virtio_hw *hw, uint8_t status)
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{
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if (status != VIRTIO_CONFIG_STATUS_RESET)
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status = (uint8_t)(status | vtpci_get_status(hw));
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VIRTIO_WRITE_REG_1(hw, VIRTIO_PCI_STATUS, status);
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}
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